How to Say "impure" in Spanish
The Spanish word for “impure” is “contaminado” — A2 level. This is a very common word in everyday Spanish.

Examples
El aire de la ciudad está muy contaminado hoy.
The city air is very polluted today.
No podemos beber este agua porque está contaminada.
We cannot drink this water because it is contaminated.
El experimento falló porque el material estaba contaminado.
The experiment failed because the material was contaminated.
Matching the Noun
This word must change its ending to match what you are describing. Use 'contaminado' for masculine things (like 'aire') and 'contaminada' for feminine things (like 'agua').
Using with 'Estar'
Since being polluted is usually a state or condition, we almost always use this word with the verb 'estar' (to be) rather than 'ser'.
Gender Mismatch
Mistake: “El agua está contaminado.”
Correction: El agua está contaminada. Even though 'agua' starts with 'el', it is a feminine word, so the adjective needs an 'a' at the end.
Related Translations
Learn Spanish with Inklingo
Interactive stories, personalized learning, and more.